The USA East Coast is the history-and-skyline itinerary. Most DialForHolidays guests start in New York City, then travel south to Philadelphia and Washington DC, or north to Boston, with Niagara Falls as the nature highlight. The distances are shorter than on the West Coast, and much of the sightseeing is on foot, by subway or on a day coach.
New York is the headline: Statue of Liberty views, Times Square, Fifth Avenue, museums and the night skyline. Washington DC is the capital of monuments and museums, many of them free to enter. Philadelphia sits between the two and is the city of the Liberty Bell and Independence Hall. Boston adds colonial streets, universities and the harbour. Niagara Falls, on the New York–Canada border, is a full-day or overnight outing from the New York / New Jersey area or from Buffalo.
East Coast packages suit families, first-time visitors and travellers who prefer cities to long desert drives. Summer is humid; autumn (late September to October) brings comfortable walking weather and, inland, fall colours. Winter can be snowy and is still popular for New York lights and indoor museums.
If you also want Hollywood or the Grand Canyon, treat that as a separate West Coast or parks module with a domestic flight, rather than squeezing both coasts into five nights.